
<h1><span class="yiyi-st" id="yiyi-12">numpy.count_nonzero</span></h1>
        <blockquote>
        <p>原文：<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.count_nonzero.html">https://docs.scipy.org/doc/numpy/reference/generated/numpy.count_nonzero.html</a></p>
        <p>译者：<a href="https://github.com/wizardforcel">飞龙</a> <a href="http://usyiyi.cn/">UsyiyiCN</a></p>
        <p>校对：（虚位以待）</p>
        </blockquote>
    
<dl class="function">
<dt id="numpy.count_nonzero"><span class="yiyi-st" id="yiyi-13"> <code class="descclassname">numpy.</code><code class="descname">count_nonzero</code><span class="sig-paren">(</span><em>a</em><span class="sig-paren">)</span></span></dt>
<dd><p><span class="yiyi-st" id="yiyi-14">计算数组<code class="docutils literal"><span class="pre">a</span></code>中非零值的数量。</span></p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name">
<col class="field-body">
<tbody valign="top">
<tr class="field-odd field"><th class="field-name"><span class="yiyi-st" id="yiyi-15">参数：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-16"><strong>a</strong>：array_like</span></p>
<blockquote>
<div><p><span class="yiyi-st" id="yiyi-17">要为其计数非零的数组。</span></p>
</div></blockquote>
</td>
</tr>
<tr class="field-even field"><th class="field-name"><span class="yiyi-st" id="yiyi-18">返回：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-19"><strong>count</strong>：int或数组int</span></p>
<blockquote class="last">
<div><p><span class="yiyi-st" id="yiyi-20">数组中的非零值数。</span></p>
</div></blockquote>
</td>
</tr>
</tbody>
</table>
<div class="admonition seealso">
<p class="first admonition-title"><span class="yiyi-st" id="yiyi-21">也可以看看</span></p>
<dl class="last docutils">
<dt><span class="yiyi-st" id="yiyi-22"><a class="reference internal" href="numpy.nonzero.html#numpy.nonzero" title="numpy.nonzero"><code class="xref py py-obj docutils literal"><span class="pre">nonzero</span></code></a></span></dt>
<dd><span class="yiyi-st" id="yiyi-23">返回所有非零值的坐标。</span></dd>
</dl>
</div>
<p class="rubric"><span class="yiyi-st" id="yiyi-24">例子</span></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">count_nonzero</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">eye</span><span class="p">(</span><span class="mi">4</span><span class="p">))</span>
<span class="go">4</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">count_nonzero</span><span class="p">([[</span><span class="mi">0</span><span class="p">,</span><span class="mi">1</span><span class="p">,</span><span class="mi">7</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">],[</span><span class="mi">3</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">19</span><span class="p">]])</span>
<span class="go">5</span>
</pre></div>
</div>
</dd></dl>
